Connect your WaniKani account
Create a personal access token at WaniKani → Settings → API Tokens. Leave every permission unticked: read-only is all this page needs.
The token is kept in this browser only and sent straight to WaniKani, never to this site's server.
Recent mistakes
WaniKani no longer keeps review history, so this page records mistakes itself by comparing your answer statistics each time it syncs. Items marked ≈ come from the first sync and are estimates.